Sometimes I wonder if we're just giant machines built by microorganisms. It would certainly make an interesting story, along the idea of a robot discovering they were made by somebody else, which I believe has already been explored
I mean it's a matter of perspective but... we are aren't we?
There is an important part in what is meant by "machine".
Mechanics, strictly speaking, is pervasive in but not sufficient to account for the life process.
There's something else going on that looks like classical teleos and both the cells and the organism have it.
There's interesting work to get teleos out of mechanics in far from equilibrium thermodynamics.. Prigogine, Kauffman, Wolfram, Deacon, England even Dennet.